5 years ago

Gellan gum–O,O′-bis(2-aminopropyl)-polyethylene glycol hydrogel for controlled fertilizer release

Gellan gum–O,O′-bis(2-aminopropyl)-polyethylene glycol hydrogel for controlled fertilizer release
A. Pawlicka, M. M. Silva, J. Kanicki, R. C. Sabadini
A gellan gum–Jeffamine superabsorbent hydrogel was obtained with different crosslink densities using different amounts of (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride) and N-hydroxysuccinimide. Infrared spectroscopy and thermal analysis confirm the crosslinking. A morphology analysis indicates denser structures for samples with higher crosslinking points. The swelling degree in high-acyl gellan gum hydrogels was equivalent to 145 times their dry weight, and 77 times when low-acyl gellan gum was used. Hydrogels also showed a 450 min water retention, as opposed to 280 min for pure water, evidencing good humidity control, suitable for use in arid climates. They also demonstrated a maximum release of commercial fertilizer of about 400 mg per gram for KH2PO4 and about 300 mg per gram for NPK 20-5-20. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45636.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/app.45636

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